/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.utils;

import org.apache.iotdb.common.rpc.thrift.TSStatus;
import org.apache.iotdb.protocol.influxdb.rpc.thrift.InfluxTSStatus;
import org.apache.iotdb.rpc.IoTDBConnectionException;
import org.apache.iotdb.tsfile.common.conf.TSFileConfig;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;
import org.influxdb.InfluxDBException;

import java.nio.ByteBuffer;
import java.util.List;

public class DataTypeUtils {

    public static final String MSG_UNSUPPORTED_DATA_TYPE = "Unsupported data type:";
    private static final byte TYPE_NULL = -2;

    /**
     * convert normal type to a type
     *
     * @param value need to convert value
     * @return corresponding TSDataType
     */
    public static TSDataType normalTypeToTSDataType(Object value) {
        if (value instanceof Boolean) {
            return TSDataType.BOOLEAN;
        } else if (value instanceof Integer) {
            return TSDataType.INT32;
        } else if (value instanceof Long) {
            return TSDataType.INT64;
        } else if (value instanceof Double) {
            return TSDataType.DOUBLE;
        } else if (value instanceof String) {
            return TSDataType.TEXT;
        } else {
            throw new InfluxDBException("Data type not valid: " + value.toString());
        }
    }

    public static InfluxTSStatus RPCStatusToInfluxDBTSStatus(TSStatus status) {
        InfluxTSStatus tsStatus = new InfluxTSStatus();
        tsStatus.setCode(status.code);
        tsStatus.setMessage(status.message);
        return tsStatus;
    }

    public static ByteBuffer getValueBuffer(List<TSDataType> types, List<Object> values)
            throws IoTDBConnectionException {
        ByteBuffer buffer = ByteBuffer.allocate(calculateLength(types, values));
        putValues(types, values, buffer);
        return buffer;
    }

    private static int calculateLength(List<TSDataType> types, List<Object> values)
            throws IoTDBConnectionException {
        int res = 0;
        for (int i = 0; i < types.size(); i++) {
            // types
            res += Byte.BYTES;
            switch (types.get(i)) {
                case BOOLEAN:
                    res += 1;
                    break;
                case INT32:
                    res += Integer.BYTES;
                    break;
                case INT64:
                    res += Long.BYTES;
                    break;
                case FLOAT:
                    res += Float.BYTES;
                    break;
                case DOUBLE:
                    res += Double.BYTES;
                    break;
                case TEXT:
                    res += Integer.BYTES;
                    res += ((String) values.get(i)).getBytes(TSFileConfig.STRING_CHARSET).length;
                    break;
                default:
                    throw new IoTDBConnectionException(MSG_UNSUPPORTED_DATA_TYPE + types.get(i));
            }
        }
        return res;
    }

    /**
     * put value in buffer
     *
     * @param types  types list
     * @param values values list
     * @param buffer buffer to insert
     * @throws IoTDBConnectionException
     */
    private static void putValues(List<TSDataType> types, List<Object> values, ByteBuffer buffer)
            throws IoTDBConnectionException {
        for (int i = 0; i < values.size(); i++) {
            if (values.get(i) == null) {
                ReadWriteIOUtils.write(TYPE_NULL, buffer);
                continue;
            }
            ReadWriteIOUtils.write(types.get(i), buffer);
            switch (types.get(i)) {
                case BOOLEAN:
                    ReadWriteIOUtils.write((Boolean) values.get(i), buffer);
                    break;
                case INT32:
                    ReadWriteIOUtils.write((Integer) values.get(i), buffer);
                    break;
                case INT64:
                    ReadWriteIOUtils.write((Long) values.get(i), buffer);
                    break;
                case FLOAT:
                    ReadWriteIOUtils.write((Float) values.get(i), buffer);
                    break;
                case DOUBLE:
                    ReadWriteIOUtils.write((Double) values.get(i), buffer);
                    break;
                case TEXT:
                    byte[] bytes = ((String) values.get(i)).getBytes(TSFileConfig.STRING_CHARSET);
                    ReadWriteIOUtils.write(bytes.length, buffer);
                    buffer.put(bytes);
                    break;
                default:
                    throw new IoTDBConnectionException(MSG_UNSUPPORTED_DATA_TYPE + types.get(i));
            }
        }
        buffer.flip();
    }
}
